installed rods, now crank feels seized up
05-30-2017, 06:56 PM
#21
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That's normal. Shouldn't be much more than 15ft-lbs to turn it over with the shortblock assembled.
The crank has a rolled fillet so it shouldn't really matter which way the rods or bearings are facing.
If it's really seizing up, then you may want to go back and make sure everything is clean and clearances are adequate. I clean everything with acetone on a paper towel before assembly. Any little dirt or debris behind the bearings can close up the clearances and cause it to seize.
The crank has a rolled fillet so it shouldn't really matter which way the rods or bearings are facing.
If it's really seizing up, then you may want to go back and make sure everything is clean and clearances are adequate. I clean everything with acetone on a paper towel before assembly. Any little dirt or debris behind the bearings can close up the clearances and cause it to seize.
Sounds to me like the big ends of those rods need to meet a sunnen hone machine I've seen rerorqued factory bolts distort the bore by as much as .001"
Pulled up GM spec with oil on threads and EPL under the bolt heads.
They needed a few honing strokes and were perfect in diameter specs and no need for the .002" over stuff.
Pulled up GM spec with oil on threads and EPL under the bolt heads.
They needed a few honing strokes and were perfect in diameter specs and no need for the .002" over stuff.
Hi, the best tech was from "Happysalesman" with the ONLY remark that the rods where installed with "flats" to Journal Fillet. (backwards)
NOW if the "flats" can be observed, there IS a difference !
What is the rod Side Clearance ?
My method is the observe the rod "touch" each journal "flat" with a easy slide in BOTH directions.
The rods "kiss" each other AND each Journal.
When one rod is found NOT to "slide", the above "tech" is well noted.
Lance
NOW if the "flats" can be observed, there IS a difference !
What is the rod Side Clearance ?
My method is the observe the rod "touch" each journal "flat" with a easy slide in BOTH directions.
The rods "kiss" each other AND each Journal.
When one rod is found NOT to "slide", the above "tech" is well noted.
Lance
is there a factory stamping anywhere on the cap and rod itself that i can match?
05-30-2017, 07:13 PM
#22
sometimes there's a dot matrix laser etch with the batch # or the weight (im not sure)
best bet is to pull them and clean 'em up and match em by hand. it's like a jigsaw puzzle, they really only fit one way.
bummer about it is that you can deform them pretty badly by torquing them on wrong. pay attention to how they fit back up. you may need to use a hone stone to knock down any burrs...or even replace any that got dinged too badly.
best bet is to pull them and clean 'em up and match em by hand. it's like a jigsaw puzzle, they really only fit one way.
bummer about it is that you can deform them pretty badly by torquing them on wrong. pay attention to how they fit back up. you may need to use a hone stone to knock down any burrs...or even replace any that got dinged too badly.
05-31-2017, 11:35 AM
#23
Those rods now need to be discarded
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
05-31-2017, 12:04 PM
#24
Those rods now need to be discarded
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
05-31-2017, 12:43 PM
#25
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Those rods now need to be discarded
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
If you torqued up the wrong caps on (not their original) rods, then they are now deformed and should be thrown the hell out.......
You have just learned the hard way that rod caps are specific to the rods
ALL RODS........not just fracture broke stuff.........ALL !!!!!!!!!!
additionally; do not attempt to find out which ones go where now because the fractured mating surfaces have now been compromised
This is true. If you want longevity and peace of mind, you need to replace these rods. Hard lesson. I must suggest that you purchase an LS engine building book. There are many subjects such as this issue that need to be handled with a high level of detail. Building a reliable engine is not hard to do but you need to possess the correct knowledge and tools.
05-31-2017, 02:30 PM
#26
Sounds like you just mixed up two caps. IF... that is the case then you should be ok swapping out just those two rods. It should be pretty obvious if any other caps were installed on the wrong rod. If there is any doubt beyond those two rod/caps then toss em all. If it were me, I'd toss them all and start fresh. Good luck! You'll get it all worked out.
